is it possible to include a new method to existing object at instance initialization? [duplicate]

Question

this is my attempt in python 3.4:

import imp

def my_example_function():
  print("my_example_function:")

class my_class:
  def __init__(self):
    module = imp.load_source(my_example_function, __file__)

my_class_instance = my_class()

result is:

Traceback (most recent call last):
  File "D:\Python34\test.py", line 10, in <module>
    my_class_instance = my_class()
  File "D:\Python34\test.py", line 8, in __init__
    module = imp.load_source(my_example_function, __file__)
  File "D:\python34\lib\imp.py", line 166, in load_source
    spec = util.spec_from_file_location(name, pathname, loader=loader)
  File "<frozen importlib._bootstrap>", line 932, in spec_from_file_location
  File "<frozen importlib._bootstrap>", line 1439, in is_package
AttributeError: 'function' object has no attribute 'rpartition'

It looks like some kind of internal error a bug in python itself.

I don't understand much from stackoverflow.com/questions/972/… as for now, can someone tell me whats wrong with my code ? Is thing that I there want to attempt even legal in python ? — rsk82
– rsk82, Commented May 11, 2014 at 10:20
As I said; importing is for modules. Adding a method to an instance is not importing. — Martijn Pieters
– Martijn Pieters, Commented May 11, 2014 at 10:24
No, the function you are using expects a string; it is documented as such. Passing in anything else breaks. — Martijn Pieters
– Martijn Pieters, Commented May 11, 2014 at 10:40

Daniel · Accepted Answer · 2014-05-11 10:38:03Z

2

the error says, that a 'function'-object has no attribute 'rpartition'. The only function object, you give to load_source is my_example_function but a name aka string is expected. And strings have a method called rpartition. So if you use load_source correctly, you won't get an error. But I cannot say, how, because I don't understand what you try to do.

answered May 11, 2014 at 10:38

Daniel

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